Romanèchite is the primary component of psilomelane, which is a “mix of minerals.” Most of psilomelane is not wholesome romanechite, rendering it wrong to treat them synonyms. Romanèchite is an important manganese ore that is necessary for making steel. Its crystal has a monoclinic structure, having a hardness of 6 with a specific gravity of 4.7-5. It is coupled with Barite, Pyrolusite, Hematite, Quartz plus other minerals of Manganese Oxide.

Chemical Formula
(BA, H2O) 2 (Mn+4, Mn+3) 5O10

Derivation of Name
Romanèchite derives its name from the area it was discovered, namely, Romanèche (now Romanèche-Thorins), 20 km west of Villefranche, Saône-et-Loire, France.

Occurrence
It is created as a result of the weathering of carbonates, oxides and silicates that bear Manganese, found as sedimentary deposits or as alternate deposits of Dolostones and Limestones and forms a major constituent of "desert varnish" (Coatings that are manganese oxide-rich, produced on rocks, especially in dry areas), in "Psilomelane and also in certain plume agates.

Gemology
Romanèchite has dark steel-gray and iron-black heaps of crystals that are extremely rare. Therefore, Romanèchite is used for ornate purposes.

Source
It is located in France, Brazil, Germany, England and different parts of the United States, which include Virginia, Arizona and Michigan.

Mineralogy
Romanechite is not an eminent mineral, but perhaps forms a part of majority of better mineral collections. It is also the main element of psilomelane which at times is considered as a mineral and occasionally considered as a rock of a combination of minerals. As a mineral, psilomelane is losing its importance and getting replaced with romanechite. Nonetheless, it could be quite incorrect as most of the samples of psilomelane are not entirely romanechite. Some books on mineralogy consider Psilomelane and Romanechite to be synonyms for the same mineral.